But it was much ado over nothing, as he was given his helmet back and returned to the sidelines less than ten minutes later.

For those asking how it's possible that Harvin could return to the field so quickly after being administered the NFL's concussion testing, their official site says on-field testing by team doctors usually takes 8-12 minutes.

"Like the preseason evaluation, the test measures memory, concentration and balance as well as measuring how quickly and thoroughly the player recalls words given to them at least five minutes earlier. As in the preseason examination, the team doctor asks players to name the month, date, day of week, year and time. The additional questions include specific sideline orientation questions that ask players to identify the venue, quarter of game, who scored most recently, the team's previous opponent and whether the team won or lost its most recent game."

UPDATE (5:57 p.m.): Harvin was the recipient of another jarring hit in the second quarter that warranted his second concussion test of the day.

Cornerback Malcolm Jenkins hit Harvin in the back in the end zone and then fell on top of him.

UPDATE (7:18 p.m.): Harvin was officially ruled out for the remainder of the game with a concussion.

Percy Harvin has a concussion and will not return to the game. #NOvsSEA